For reference, Hudy wrote me and said the 1/8 adapter does 80mm by 140mm max, the other adapters change the hub but don't improve the overall dimensions.
Maybe the DuBro balancer with the mod is the way to go since I cannot find the Ultimate Racing balancer anywhere.
I found a couple of sites that carry it but they tell me it's discontinued, it looks like it might be in stock in a couple of local UK sites but none I found tht offers international shipping on their web page, need to email and ask.
I went looking for the Ballistic balancer as well since it seems it's just a DuBro mod already completed but I had no luck finding it in stock anywhere either.
CHeck this thread out. I put some pics in there on the Dubro balancer as well a while back. I think this might help you out. It is pretty easy to setup just about anywhere you like.